Fixed contact fixing structure

Abstract

The utility model discloses a static contact fixing structure, which comprises a shell and a static contact, the static contact comprises a contact plate and a contact arranged at one end of the contact plate, the shell and the contact plate are locked and fixed through a screw and form tight contact fit, and the contact plate and the shell are in contact fit with each other in two matching surfaces of the contact plate and the shell. Wherein one matching surface is provided with a first boss, and the other matching surface is provided with a groove which is matched with the first boss for insertion and positioning. The problem that the contact plate is easy to rotate is solved. The fixed contact fixing structure can solve the problem that the contact plate is easy to rotate.

Description

Technical Field

[0001] The utility model relates to a stationary contact fixing structure. Background Art

[0002] The static contact is an important component of the contactor, and is installed and fixed in conjunction with the contactor housing. The static contact of the contactor includes a contact and a contact plate. The contact plate and the contactor housing are generally fixed by screws. One end of the contact plate is passed through the inner side of the housing, and the contact is fixedly installed on this end of the contact plate. The other end of the contact plate is passed through the outer side of the housing for matching wiring.

[0003] A contact plate fixing structure (CN103681111B) is disclosed in a Chinese invention patent, which includes a shell (i.e., a housing) and a contact plate. A slot is formed on the shell, and the slot limits the contact plate from continuing to move along its insertion direction after the contact plate is inserted into a certain position. A boss is formed on the contact plate, and the boss has an arc-shaped edge. The shell is formed with an elastic slot for inserting the boss. When the contact plate is inserted into the slot to a certain position and is limited by the slot and cannot continue to move forward, the elastic slot and the arc-shaped edge of the boss form an undercut structure to prevent the contact plate from moving in the direction opposite to its insertion direction.

[0004] The above patents have solved the problem that the contact plate is prone to loosening in the direction opposite to the insertion direction after long-term use. However, in fact, the contact plate may also move in other directions. For example, for contactors of medium-capacity contactors and other types, considering space and cost factors, after the contact plate is inserted into the slot of the shell, it is generally necessary to install and fix the contact plate and the shell of the contactor by a screw. The contact plate and the shell are pressed together by the screw, and the friction force is used to achieve relative fixation of the two. However, during the process of screw locking, the contact plate is prone to rotate around the screw due to the large tightening force of the screw. In addition, the other end of the contact plate is also prone to rotate due to the large wiring torque during the wiring process, causing the contact plate to deviate from the originally predetermined installation position. In particular, an arc extinguishing member is usually installed between the side wall of the slot and the contact plate. The arc extinguishing member is positioned by an arc extinguishing member boss integrally formed on the bottom wall of the slot. When the contact plate is rotated under force, the arc extinguishing member boss is easily damaged, affecting the positioning and installation effect of the arc extinguishing member. Summary of the invention

[0005] The utility model provides a static contact fixing structure, which can solve the problem that the contact plate is easy to rotate.

[0006] The utility model discloses a fixed contact structure, comprising a shell and a fixed contact. The fixed contact comprises a contact plate and a contact arranged at one end of the contact plate. The shell and the contact plate are fixed by screw locking and form a tight contact fit. Among the two mating surfaces of the contact plate and the shell, one mating surface is provided with a first boss, and the other mating surface is provided with a groove which is plugged and positioned with the first boss. The first boss and the groove can be kept in a plugged state by the screw locking and fixing, so that a reliable positioning fit is formed between the shell and the contact plate, so that the shell and the contact plate will not move relative to each other, especially the contact plate will not rotate during the screw tightening process and the wiring process, so as to ensure the reliable fixation of the contact plate.

[0007] In addition, during assembly, the contact plate and the housing can be initially positioned via the first boss and the groove, making it easier to install the screws.

[0008] Furthermore, the contact is welded and fixed on the other side of the contact plate opposite to its mating surface, and the other side of the contact plate is provided with a second boss which cooperates with and limits the side of the contact. When the contact is welded and fixed on the contact plate, the second boss can limit the contact, which can effectively locate the welding position of the contact and prevent the contact from shifting during welding.

[0009] Furthermore, the second boss and the contact plate are integrally formed, which facilitates the production and processing of the static contact. In other technical solutions, the second boss can also be split and can be fixed to the contact plate by welding, riveting or other connection methods.

[0010] Furthermore, the second boss is formed by stamping, which facilitates the production and processing of the static contact.

[0011] Furthermore, the first boss is arranged on the mating surface of the shell, the groove is arranged on the mating surface of the contact plate, the groove and the second boss are arranged at corresponding positions and are formed simultaneously by stamping. During the processing, the punching head stamps one side of the mating surface of the contact plate, so as to form a groove on the mating surface and simultaneously form a second boss at a corresponding position on the other side, thereby facilitating the simultaneous processing and forming of the second boss and the groove.

[0012] Furthermore, the first boss and the housing are integrally formed by injection molding.

[0013] Furthermore, the profile of the plug-in fitting of the first boss and the groove is non-circular, and when the contact plate and the shell are initially positioned by the first boss and the groove, relative rotation between the contact plate and the shell can be prevented, thereby ensuring the alignment of the screw holes and facilitating the installation of the screws.

[0014] The beneficial effects of the utility model are as follows: the utility model has a simple structure and is easy to process, and can prevent the contact plate from rotating due to the influence of the screw tightening force and the wiring torque, so that the installation of the wiring board and the housing is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of an embodiment of the utility model;

[0016] Figure 2 This is a structural exploded view of an embodiment of the utility model;

[0017] Figure 3 A top view of an embodiment of the utility model;

[0018] Figure 4 for Figure 2 Section view of the AA section line;

[0019] Figure 5 The structure of the static contact in the embodiment of the utility model is Figure 1 ;

[0020] Figure 6 The structure of the static contact in the embodiment of the utility model is Figure 2 ;

[0021] In the figure: 1. shell; 1a. mating surface of shell; 10. connecting hole of shell; 11. mounting groove; 12. first boss; 2. static contact; 21. contact plate; 21a. mating surface of contact plate; 21b. other side of contact plate; 210. connecting hole of contact plate; 211. groove; 212. second boss; 22. contact; 3. screw. DETAILED DESCRIPTION

[0022] The utility model provides an embodiment of a stationary contact fixing structure, such as Figure 1-6As shown, it includes a shell 1 and a static contact 2. The static contact 2 includes a contact plate 21 and a contact 22 arranged at one end of the contact plate 21. The shell 1 includes a mounting groove 11 for accommodating the contact 22. The shell 1 and the contact plate 21 are locked and fixed by screws 3 to form a tight contact fit. Among the two mating surfaces of the contact plate 21 and the shell 1, a groove 211 is provided on the mating surface 21a of the contact plate 21. The mating surface 1a of the shell 1 (which is also the inner wall of the mounting groove 11) is provided with a first boss 12 that is plugged and positioned with the groove 211. The first boss 12 and the shell 1 are integrally formed by injection molding. The first boss 12 and the groove 211 can be kept in a plugged state by being locked and fixed with the screws 3, so that a reliable positioning fit is formed between the shell 1 and the contact plate 21, so that the shell 1 and the contact plate 21 will not move relative to each other, especially the contact plate 21 will not rotate during the screw tightening process and the wiring process, so as to ensure a reliable connection and fixation between the contact plate 21 and the shell 1.

[0023] The contact plate 21 and the housing 1 are correspondingly provided with connecting holes (210, 10) for the screws 3 to be inserted and installed. During assembly, the contact plate 21 and the housing 1 can also be initially positioned through the first boss 12 and the groove 211, so that the connecting holes (210, 10) of the contact plate 21 and the housing 1 are in an aligned state, which facilitates the subsequent insertion and installation of the screws 3.

[0024] In other embodiments, the first boss 12 and the groove 211 may also be respectively arranged on the contact plate 21 and the housing 1 , which can also achieve the same effect.

[0025] The contact 22 is welded and fixed on the other side 21b of the contact plate 21 opposite to its mating surface 21a. The other side 21b of the contact plate 21 is provided with a second boss 212 that cooperates with the side of the contact 22 to limit the position. When the contact 22 is welded and fixed on the contact plate 21, the second boss 212 can limit the contact 22, which can effectively locate the welding position of the contact 22 and prevent the contact 22 from shifting during welding.

[0026] The second boss 212 is integrally formed on the body of the contact plate 21 by stamping, which facilitates the production and processing of the static contact 2. In other embodiments, the second boss 212 may also be split and may be fixed to the contact plate 21 by welding, riveting, or other connection methods.

[0027] The groove 211 and the second boss 212 are arranged at corresponding positions on both sides of the contact plate 21 and are simultaneously formed by stamping. During the processing, the punching head stamps one side of the mating surface 21a of the contact plate 21, so that the groove 211 can be formed on the mating surface 21a and the second boss 212 can be formed at the corresponding position on the other side 21b at the same time, which facilitates the simultaneous processing and forming of the groove 211 and the second boss 212.

[0028] In addition, the profile of the plug-in fitting of the first boss 12 and the groove 211 (i.e., the cross-sectional profile of the first boss 12 and the groove 211 along the plug-in direction) is a non-circular shape, and in this embodiment, a rectangle is used, and in other embodiments, it can also be a non-circular shape such as a triangle, a polygon, an ellipse, etc., so that when the contact plate 21 and the shell 1 are initially positioned by the first boss 12 and the groove 211, relative rotation between the contact plate 21 and the shell 1 can be prevented, and the alignment of the two connecting holes (210, 10) is ensured, thereby facilitating the insertion and installation of the screw 3.

[0029] The above embodiment is only one of the preferred specific embodiments of the present invention. Common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A fixed contact structure, comprising a housing and a fixed contact, wherein the fixed contact comprises a contact plate and a contact arranged at one end of the contact plate, wherein the housing and the contact plate are fixed by screws to form a tight contact fit, and wherein: Of the two mating surfaces that are in contact with the contact plate and the housing, one of the mating surfaces is provided with a first boss, and the other mating surface is provided with a groove that is plugged and positioned to cooperate with the first boss.

2. A stationary contact fixing structure according to claim 1, characterized in that: The contact is welded and fixed on the other side of the contact plate opposite to its mating surface, and the other side of the contact plate is provided with a second boss which is matched and limited with the side portion of the contact.

3. A stationary contact fixing structure according to claim 2, characterized in that: The second boss and the contact plate are integrally formed.

4. A stationary contact fixing structure according to claim 3, characterized in that: The second boss is formed by stamping.

5. A stationary contact fixing structure according to claim 4, characterized in that: The first boss is arranged on the matching surface of the housing, the groove is arranged on the matching surface of the contact plate, and the groove and the second boss are arranged at corresponding positions and are formed by stamping at the same time.

6. A stationary contact fixing structure according to claim 5, characterized in that: The first boss and the housing are integrally formed by injection molding.

7. A stationary contact fixing structure according to claim 1, characterized in that: The profile of the plug-in fitting portion of the first boss and the groove is non-circular.

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